// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE

(function(mod) {
  if (typeof exports == 'object' && typeof module == 'object')
    // CommonJS
    mod(require('./lib/codemirror'));
  else if (typeof define == 'function' && define.amd)
    // AMD
    define(['./lib/codemirror'], mod);
  // Plain browser env
  else mod(CodeMirror);
})(function(CodeMirror) {
  'use strict';

  CodeMirror.showHint = function(cm, getHints, options) {
    // We want a single cursor position.
    if (cm.somethingSelected()) return;
    if (getHints == null) getHints = cm.getHelper(cm.getCursor(), 'hint');
    if (getHints == null) return;

    if (cm.state.completionActive) cm.state.completionActive.close();

    var completion = (cm.state.completionActive = new Completion(
      cm,
      getHints,
      options || {}
    ));
    CodeMirror.signal(cm, 'startCompletion', cm);
    if (completion.options.async)
      getHints(
        cm,
        function(hints) {
          completion.showHints(hints);
        },
        completion.options
      );
    else return completion.showHints(getHints(cm, completion.options));
  };

  function Completion(cm, getHints, options) {
    this.cm = cm;
    this.getHints = getHints;
    this.options = options;
    this.widget = this.onClose = null;
  }

  Completion.prototype = {
    close: function() {
      if (!this.active()) return;
      this.cm.state.completionActive = null;

      if (this.widget) this.widget.close();
      if (this.onClose) this.onClose();
      CodeMirror.signal(this.cm, 'endCompletion', this.cm);
    },

    active: function() {
      return this.cm.state.completionActive == this;
    },

    pick: function(data, i) {
      var completion = data.list[i];
      if (completion.hint) completion.hint(this.cm, data, completion);
      else this.cm.replaceRange(getText(completion), data.from, data.to);
      this.close();
    },

    showHints: function(data) {
      if (!data || !data.list.length || !this.active()) return this.close();

      if (this.options.completeSingle != false && data.list.length == 1)
        this.pick(data, 0);
      else this.showWidget(data);
    },

    showWidget: function(data) {
      this.widget = new Widget(this, data);
      CodeMirror.signal(data, 'shown');

      var debounce = null,
        completion = this,
        finished;
      var closeOn = this.options.closeCharacters || /[\s()\[\]{};:>,]/;
      var startPos = this.cm.getCursor(),
        startLen = this.cm.getLine(startPos.line).length;

      function done() {
        if (finished) return;
        finished = true;
        completion.close();
        completion.cm.off('cursorActivity', activity);
        CodeMirror.signal(data, 'close');
      }
      function isDone() {
        if (finished) return true;
        if (!completion.widget) {
          done();
          return true;
        }
      }

      function update() {
        if (isDone()) return;
        CodeMirror.signal(data, 'update');
        if (completion.options.async)
          completion.getHints(completion.cm, finishUpdate, completion.options);
        else
          finishUpdate(completion.getHints(completion.cm, completion.options));
      }
      function finishUpdate(data_) {
        data = data_;
        if (isDone()) return;
        if (!data || !data.list.length) return done();
        completion.widget.close();
        completion.widget = new Widget(completion, data);
      }

      function activity() {
        clearTimeout(debounce);
        var pos = completion.cm.getCursor(),
          line = completion.cm.getLine(pos.line);
        if (
          pos.line != startPos.line ||
          line.length - pos.ch != startLen - startPos.ch ||
          pos.ch < startPos.ch ||
          completion.cm.somethingSelected() ||
          (pos.ch && closeOn.test(line.charAt(pos.ch - 1)))
        )
          completion.close();
        else debounce = setTimeout(update, 170);
      }
      this.cm.on('cursorActivity', activity);
      this.onClose = done;
    }
  };

  function getText(completion) {
    if (typeof completion == 'string') return completion;
    else return completion.text;
  }

  function buildKeyMap(options, handle) {
    var baseMap = {
      Up: function() {
        handle.moveFocus(-1);
      },
      Down: function() {
        handle.moveFocus(1);
      },
      PageUp: function() {
        handle.moveFocus(-handle.menuSize());
      },
      PageDown: function() {
        handle.moveFocus(handle.menuSize());
      },
      Home: function() {
        handle.setFocus(0);
      },
      End: function() {
        handle.setFocus(handle.length);
      },
      Enter: handle.pick,
      Tab: handle.pick,
      Esc: handle.close
    };
    var ourMap = options.customKeys ? {} : baseMap;
    function addBinding(key, val) {
      var bound;
      if (typeof val != 'string')
        bound = function(cm) {
          return val(cm, handle);
        };
      // This mechanism is deprecated
      else if (baseMap.hasOwnProperty(val)) bound = baseMap[val];
      else bound = val;
      ourMap[key] = bound;
    }
    if (options.customKeys)
      for (var key in options.customKeys)
        if (options.customKeys.hasOwnProperty(key))
          addBinding(key, options.customKeys[key]);
    if (options.extraKeys)
      for (var key in options.extraKeys)
        if (options.extraKeys.hasOwnProperty(key))
          addBinding(key, options.extraKeys[key]);
    return ourMap;
  }

  function Widget(completion, data) {
    this.completion = completion;
    this.data = data;
    var widget = this,
      cm = completion.cm,
      options = completion.options;

    var hints = (this.hints = document.createElement('ul'));
    hints.className = 'CodeMirror-hints';
    this.selectedHint = 0;

    var completions = data.list;
    for (var i = 0; i < completions.length; ++i) {
      var elt = hints.appendChild(document.createElement('li')),
        cur = completions[i];
      var className = 'CodeMirror-hint' + (i ? '' : ' CodeMirror-hint-active');
      if (cur.className != null) className = cur.className + ' ' + className;
      elt.className = className;
      if (cur.render) cur.render(elt, data, cur);
      else
        elt.appendChild(
          document.createTextNode(cur.displayText || getText(cur))
        );
      elt.hintId = i;
    }

    var pos = cm.cursorCoords(
      options.alignWithWord !== false ? data.from : null
    );
    var left = pos.left,
      top = pos.bottom,
      below = true;
    hints.style.left = left + 'px';
    hints.style.top = top + 'px';
    // If we're at the edge of the screen, then we want the menu to appear on the left of the cursor.
    var winW =
      window.innerWidth ||
      Math.max(document.body.offsetWidth, document.documentElement.offsetWidth);
    var winH =
      window.innerHeight ||
      Math.max(
        document.body.offsetHeight,
        document.documentElement.offsetHeight
      );
    var box = hints.getBoundingClientRect();
    var overlapX = box.right - winW,
      overlapY = box.bottom - winH;
    if (overlapX > 0) {
      if (box.right - box.left > winW) {
        hints.style.width = winW - 5 + 'px';
        overlapX -= box.right - box.left - winW;
      }
      hints.style.left = (left = pos.left - overlapX) + 'px';
    }
    if (overlapY > 0) {
      var height = box.bottom - box.top;
      if (box.top - (pos.bottom - pos.top) - height > 0) {
        overlapY = height + (pos.bottom - pos.top);
        below = false;
      } else if (height > winH) {
        hints.style.height = winH - 5 + 'px';
        overlapY -= height - winH;
      }
      hints.style.top = (top = pos.bottom - overlapY) + 'px';
    }
    (options.container || document.body).appendChild(hints);

    cm.addKeyMap(
      (this.keyMap = buildKeyMap(options, {
        moveFocus: function(n) {
          widget.changeActive(widget.selectedHint + n);
        },
        setFocus: function(n) {
          widget.changeActive(n);
        },
        menuSize: function() {
          return widget.screenAmount();
        },
        length: completions.length,
        close: function() {
          completion.close();
        },
        pick: function() {
          widget.pick();
        }
      }))
    );

    if (options.closeOnUnfocus !== false) {
      var closingOnBlur;
      cm.on(
        'blur',
        (this.onBlur = function() {
          closingOnBlur = setTimeout(function() {
            completion.close();
          }, 100);
        })
      );
      cm.on(
        'focus',
        (this.onFocus = function() {
          clearTimeout(closingOnBlur);
        })
      );
    }

    var startScroll = cm.getScrollInfo();
    cm.on(
      'scroll',
      (this.onScroll = function() {
        var curScroll = cm.getScrollInfo(),
          editor = cm.getWrapperElement().getBoundingClientRect();
        var newTop = top + startScroll.top - curScroll.top;
        var point =
          newTop -
          (window.pageYOffset ||
            (document.documentElement || document.body).scrollTop);
        if (!below) point += hints.offsetHeight;
        if (point <= editor.top || point >= editor.bottom)
          return completion.close();
        hints.style.top = newTop + 'px';
        hints.style.left = left + startScroll.left - curScroll.left + 'px';
      })
    );

    CodeMirror.on(hints, 'dblclick', function(e) {
      var t = e.target || e.srcElement;
      if (t.hintId != null) {
        widget.changeActive(t.hintId);
        widget.pick();
      }
    });
    CodeMirror.on(hints, 'click', function(e) {
      var t = e.target || e.srcElement;
      if (t.hintId != null) widget.changeActive(t.hintId);
    });
    CodeMirror.on(hints, 'mousedown', function() {
      setTimeout(function() {
        cm.focus();
      }, 20);
    });

    CodeMirror.signal(data, 'select', completions[0], hints.firstChild);
    return true;
  }

  Widget.prototype = {
    close: function() {
      if (this.completion.widget != this) return;
      this.completion.widget = null;
      this.hints.parentNode.removeChild(this.hints);
      this.completion.cm.removeKeyMap(this.keyMap);

      var cm = this.completion.cm;
      if (this.completion.options.closeOnUnfocus !== false) {
        cm.off('blur', this.onBlur);
        cm.off('focus', this.onFocus);
      }
      cm.off('scroll', this.onScroll);
    },

    pick: function() {
      this.completion.pick(this.data, this.selectedHint);
    },

    changeActive: function(i) {
      i = Math.max(0, Math.min(i, this.data.list.length - 1));
      if (this.selectedHint == i) return;
      var node = this.hints.childNodes[this.selectedHint];
      node.className = node.className.replace(' CodeMirror-hint-active', '');
      node = this.hints.childNodes[(this.selectedHint = i)];
      node.className += ' CodeMirror-hint-active';
      if (node.offsetTop < this.hints.scrollTop)
        this.hints.scrollTop = node.offsetTop - 3;
      else if (
        node.offsetTop + node.offsetHeight >
        this.hints.scrollTop + this.hints.clientHeight
      )
        this.hints.scrollTop =
          node.offsetTop + node.offsetHeight - this.hints.clientHeight + 3;
      CodeMirror.signal(
        this.data,
        'select',
        this.data.list[this.selectedHint],
        node
      );
    },

    screenAmount: function() {
      return (
        Math.floor(
          this.hints.clientHeight / this.hints.firstChild.offsetHeight
        ) || 1
      );
    }
  };
});
